Bug 19229: Return to course when cancelling out of edit form

Bug 19229: Return to course when cancelling out of edit form

To test:
1) Ensure UseCourseReserves is enabled
2) Go to Course Reserves, create a course
3) Edit course
4) Click Cancel
5) Notice you are returned to the courses home page rather than returned
to the course
6) Apply patch
7) Go to edit course and click cancel again
8) Confirm you are returned to the course and that this feels like the
natural expectation.

Sponsored-by: Catalyst IT
Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>